炼钢 ›› 2021, Vol. 37 ›› Issue (2): 58-61.

• 产品工艺与质量控制 • 上一篇    下一篇

硅脱氧弹簧钢55SiCr玻璃态夹杂在铸坯加热过程中的结晶变化

孟耀青1,2,王  伟1,2,李家杨1,2,赵昊乾1,2,逯志方1,2,秦树超1,2   

  1. (1.邢台钢铁有限责任公司 技术中心,河北 邢台 054027;
    2.河北省线材工程技术创新中心,河北 邢台 054027)
  • 出版日期:2021-04-05 发布日期:2021-03-30

Crystallization behavior of glassy inclusions in Si-killed spring steel 55SiCr during bloom and billet heating

  • Online:2021-04-05 Published:2021-03-30

摘要: 将55SiCr硅脱氧弹簧钢LF精炼结束提桶样分别随大方坯开坯加热和热轧坯轧制加热处理,并采用FEI Explorer 4自动扫描电镜对提桶样热处理前后氧化物夹杂的形貌与成分变化进行检测。检测分析表明,不管是随大方坯高温扩散还是热轧坯加热处理,玻璃态夹杂物均发生结晶现象。在1 250 ℃保温约2.5 h,夹杂物结晶尺寸较大,且结晶位置已贯穿夹杂物内部;在1 020 ℃保温约0.5 h,夹杂物结晶尺寸较小,大颗粒结晶位置主要发生在夹杂物边部。


关键词: 弹簧钢, 硅脱氧, 玻璃态夹杂, 结晶

Abstract: The bucket-shaped samplers of Si-killed spring steel 55SiCr after LF refining were heated with bloom before blooming and billet before hot rolling respectively. And the morphology and composition changes of oxide inclusions before and after heat treatment were detected by FEI Explorer 4 automated scanning electron microscope. The results show that some crystalline phases appears on the glassy inclusions in both cases. When the holding temperature is kept at 1 250 ℃ for about 2.5 h, the crystalline phase is coarse and the crystallization position has penetrated through the whole inclusions. In contrast, when the holding temperature is kept at 1 020 ℃ for about 0.5 h, the crystallizing size is small, and the crystallization position of large particle mainly occurs at the edge of inclusions.


Key words: spring steel, Si-killed, glassy inclusions, crystallization